Whey or Soy?

Im just starting a low carb diet and it calls for me to make a protien shake and it gives me recipes for several different shakes, but it tells me to choose whatever protien powder i prefer, so i was wondering whats better whey protein powder or soy protein powder. I talked to a guy at vitaminworld where i was gonna buy the powder and he told me that most women prefer soy and that whey was a little more intense.
Which do yall prefer and what r the advantages and disadvantages.